WIP: A couple of more ChannelMojo speedup ideas

third_party/mojo/src/mojo/edk/system/local_message_pipe_endpoint.h

Index: third_party/mojo/src/mojo/edk/system/local_message_pipe_endpoint.h
diff --git a/third_party/mojo/src/mojo/edk/system/local_message_pipe_endpoint.h b/third_party/mojo/src/mojo/edk/system/local_message_pipe_endpoint.h
index f792d90ac0f69fcef93b14d2257f11f3be0e01cf..61b52b3b060e48e65f0324347602693e79b89a3f 100644
--- a/third_party/mojo/src/mojo/edk/system/local_message_pipe_endpoint.h
+++ b/third_party/mojo/src/mojo/edk/system/local_message_pipe_endpoint.h
@@ -29,6 +29,7 @@ class MOJO_SYSTEM_IMPL_EXPORT LocalMessagePipeEndpoint
   Type GetType() const override;
   bool OnPeerClose() override;
   void EnqueueMessage(scoped_ptr<MessageInTransit> message) override;
+  void OnReadMessage(MessageInTransit::ReadContext& reading_message) override;
 
   // There's a dispatcher for |LocalMessagePipeEndpoint|s, so we have to
   // implement/override these:
@@ -46,6 +47,8 @@ class MOJO_SYSTEM_IMPL_EXPORT LocalMessagePipeEndpoint
                          HandleSignalsState* signals_state) override;
   void RemoveAwakable(Awakable* awakable,
                       HandleSignalsState* signals_state) override;
+  MojoResult SetAsyncMessageCallback(
+      const AsyncMessageCallback& callback) override;
 
   // This is only to be used by |MessagePipe|:
   MessageInTransitQueue* message_queue() { return &message_queue_; }
@@ -57,6 +60,7 @@ class MOJO_SYSTEM_IMPL_EXPORT LocalMessagePipeEndpoint
   // Queue of incoming messages.
   MessageInTransitQueue message_queue_;
   AwakableList awakable_list_;
+  AsyncMessageCallback message_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalMessagePipeEndpoint);
 };